What'll end up happening is more and more people will use the party finder, which will only make solo queues even longer. The Duty Finder will only place 8-player parties queueing for CT with other 8-player parties. People are getting really annoyed by this and it's not going to just go away. The easiest fix is to simply prevent the Duty Finder from telling players if the dungeon queue they just popped is a fresh instance or an in-progress run. That way they won't know if the dungeon's been half-cleared until they queue inside and at that point, leaving would result in a 30 minute deserter penalty.